Reviewed by Dave Hyatt.

        - fix <rdar://problem/6059648> Some content not visible when the window is short at courtneyalbright.com

        Test: fast/overflow/float-in-relpositioned.html

        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::lowestPosition): Add this block's relative offset
        to floats' and positioned objects' lowest position.
        (WebCore::RenderBlock::rightmostPosition): Ditto.
        (WebCore::RenderBlock::leftmostPosition): Ditto.
        * rendering/RenderBox.cpp:
        (WebCore::RenderBox::lowestPosition): Removed redundant test.
        (WebCore::RenderBox::rightmostPosition): Ditto.
        (WebCore::RenderBox::leftmostPosition): Ditto.

LayoutTests:

        Reviewed by Dave Hyatt.

        - test, updated test and results for <rdar://problem/6059648> Some content not visible when the window is short at courtneyalbright.com

        * fast/overflow/float-in-relpositioned.html: Added.
        * fast/repaint/containing-block-position-change.html: Changed to avoid
        a full repaint due to a scroll bar appearing.
        * platform/mac/fast/clip/015-expected.txt:
        * platform/mac/fast/overflow/float-in-relpositioned-expected.checksum: Added.
        * platform/mac/fast/overflow/float-in-relpositioned-expected.png: Added.
        * platform/mac/fast/overflow/float-in-relpositioned-expected.txt: Added.
        * platform/mac/fast/repaint/clipped-relative-expected.txt:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@35427 268f45cc-cd09-0410-ab3c-d52691b4dbfc